The by-pass valve is an unloading valve for the piston pump, providing remote switching between idling and operation. They are usually found on vehicles fitted with hydraulic equipment that needs to be manouvered when on the move and the PTO is not disengaged during transport i.e. refuse collection trucks, road sweepers, concrete mixers. The valve is controlled from the driver's cab and makes it possible to provide oil to the vehicle's hydraulic equipment when necessary

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